<html>
    <head>
        <link rel="stylesheet" href="static/css/test.css">
    </head>
    <body>  
        <form action="/login" method="POST">
            <p>Username:    <input type='test' name="username" required placeholder="please input your username!"></p>
            <p>Password:    <input type='text' name="password" required placeholder="please input your password!"></p>
            <p><input type="submit" value="login"></p>
        </form>
    </body>
</html>